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5. Function of the LMU64 060D168 Controller
Légende :
WDPS = water differential pressure switch, WPS = water pressure switch
LS = limit thermostat
= Alarm
= Flame established
= Ignition electrode
= Air pressure switch
= gas valve
= Burner fan
N maxi = maximum speed allowed.
N ignition = speed at ignition.
N mini = minimum speed allowed during modulation
N stop = speed less than 200rpm
NOTE : Should ignition fail at start up, the LMU will initiate 1 to 4 further attempts before going to lock-out
speed of burner fan
0 2 3 4,5 6 10, 11, 12 20 22 1 99
VStart air purge. pilot control box Modul ati on continuous return to Lock-out lock-out
purge periode ignition checks run start at start
N maxi
N ignition
N mini
N stop
5 s . 4,8 s. 10 s . t
Phase
CD, TL
Heat demand
P
0 s.
11 s.
WDPS, WPS, LS
6. Commissioning
6.1. Check all preparatory conditions
With a cascade system, check for equal flow
through all the boilers.
Check that there is a minimum water pressure 1 BAR
on each boiler.
With a V F replacement boiler, checked that
the existing system is flushed and clean
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